Managed to get compiling under ubuntu

CMakeLists.txt

@@ -22,6 +22,8 @@ set(SETTING_PLATFORM_GLFW 1)
 set(SETTING_PLATFORM_SDL 2)
 set(SETTING_PLATFORM SETTING_PLATFORM_SDL)
 
+set(SETTING_USE_GLAD 0)
+
 # Game Settings
 set(SETTING_GAME_POKER 1)
 set(SETTING_GAME_DAWN 2)
@@ -66,11 +68,18 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 add_executable(${PROJECT_NAME} ${HEADER_FILES} ${SOURCE_FILES})
 
 ################################# STATIC LIBS ##################################
-# GLFW and GLAD
-if(${SETTING_PLATFORM} EQUAL ${SETTING_PLATFORM_GLFW})
+
+# Math
+target_link_libraries(${PROJECT_NAME} m)
+
+# GLAD
+if(${SETTING_USE_GLAD} EQUAL 1)
   add_subdirectory(${CMAKE_SOURCE_DIR}/lib/glad)
   target_link_libraries(${PROJECT_NAME} glad)
-  
+endif()
+
+# GLFW and GLAD
+if(${SETTING_PLATFORM} EQUAL ${SETTING_PLATFORM_GLFW})
   if(NOT glfw3_FOUND)
     FetchContent_Declare(
       glfw
@@ -84,8 +93,8 @@ endif()
 
 # SDL
 if(${SETTING_PLATFORM} EQUAL ${SETTING_PLATFORM_SDL})
-  add_subdirectory(${CMAKE_SOURCE_DIR}/lib/glad)
-  target_link_libraries(${PROJECT_NAME} glad)
+  # add_subdirectory(${CMAKE_SOURCE_DIR}/lib/glad)
+  # target_link_libraries(${PROJECT_NAME} glad)
   find_package(SDL2 REQUIRED)
   include_directories(${SDL2_INCLUDE_DIRS})
   target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARIES})